Back firing intermittent fault ?

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Mobile mechanic ?

Mk1 golf gl 1982 with Webber carburettorcar starts first time, runs perfectly but without warning suddenly starts back firing and cuts out it does restart by stutters until I get up to speedand then it will cut out and the next set of lights, I'm not much of a mechanic am looking for some advice or help, I have changed the fuel filter,dizzy cap rotor arm al leads spark plugs but no change, for some reason every time I take the dizzy cap off and put it back on it seems to improve.does anyone know a mobile mechanic or someone that could have a look at it for me.Thank you